<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
    <style>
      p {
        height: 200px;
        border: solid;
        font-size: 40px;
      }
    </style>
  </head>
  <body>
    <p>hello p1</p>
    <p>hello p2</p>
    <p>hello p3</p>
    <p>hello p4</p>
    <p>hello p5</p>
    <p>hello p6</p>
    <p>hello p7</p>
    <p>hello p8</p>
    <p>hello p9</p>
    <script>
      window.onscroll = function () {
        const r =
          document.documentElement.scrollHeight -
            window.pageYOffset -
            window.innerHeight <
          60;
        if (r) {
          // 新内容
          const p = document.createElement("p");
          p.innerHTML = "new P";
          document.body.append(p);
        }
      };
    </script>
  </body>
</html>
